/*
 * Copyright (C) 2016 Rockchip Electronics Co., Ltd.
 * Authors:
 *    Zhiqin Wei <wzq@rock-chips.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef _LIBS_RGA_SINGLETON_H
#define _LIBS_RGA_SINGLETON_H

#ifndef ANDROID
#include "RgaMutex.h"

#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wundefined-var-template"
#endif

template <typename TYPE> class Singleton {
public:
  static TYPE &getInstance() {
    Mutex::Autolock _l(sLock);
    TYPE *instance = sInstance;
    if (instance == nullptr) {
      instance = new TYPE();
      sInstance = instance;
    }
    return *instance;
  }

  static bool hasInstance() {
    Mutex::Autolock _l(sLock);
    return sInstance != nullptr;
  }

protected:
  ~Singleton() {}
  Singleton() {}

private:
  Singleton(const Singleton &);
  Singleton &operator=(const Singleton &);
  static Mutex sLock;
  static TYPE *sInstance;
};

#if defined(__clang__)
#pragma clang diagnostic pop
#endif

#define RGA_SINGLETON_STATIC_INSTANCE(TYPE)                                    \
  template <>::Mutex(::Singleton<TYPE>::sLock)(::Mutex::PRIVATE);              \
  template <> TYPE * ::Singleton<TYPE>::sInstance(nullptr); /* NOLINT */       \
  template class ::Singleton<TYPE>;

#endif // ANDROID
#endif //_LIBS_RGA_SINGLETON_H
